«اِلْقُلُوبْ مُوشْ زَيِّ بَعْضَهَا»

The saying observes that inner lives vary from one person to the next. The word 'heart' stands for what someone privately feels and intends, and that hidden content cannot be assumed to match across individuals, even among people who seem close, friendly, or outwardly similar.

Its practical edge is a warning about using oneself as the yardstick. Someone who feels warmly toward a neighbor may expect the same warmth in return, yet their own sentiment offers no proof of what the neighbor carries inside. Expectations about others should rest on more than one's own disposition.

Fits moments when someone's trust or expectations rest on the belief that others think as they do, for instance after an unexpected betrayal or an undeserved kindness. It can console the surprised person, or advise caution before counting on goodwill being returned.